gistfile1.js

var CMBAdmin = function() {

	var self = this;

	self.init = function() {

		self.$contentFormatSelect = jQuery('.field#content-format select' ).first();

		self.$metaboxes         = self.$contentFormatSelecself.closest('.cmb_metabox');
		self.$videoField        = jQuery('.field#content-video' ).closest('.cmb-row');
		self.$audioField        = jQuery('.field#content-audio' ).closest('.cmb-row');
		self.$playlistField     = jQuery('.field#content-playlist' ).closest('.cmb-row');
		self.$pdfField          = jQuery('.field#content-pdf' ).closest('.cmb-row');
		self.$specialDocField   = jQuery('.field#content-special-doc' ).closest('.cmb-row');

		if ( self.$specialDocField.length > 0 ) {
			self.$specialDocField.find( '.select2-added' ).removeClass('select2-added').select2( 'destroy' );
		}

		self.toggleVisibleFields();
		self.$contentFormatSelecself.change( self.toggleVisibleFields );

	}

	self.toggleVisibleFields = function() {

		var currentType = self.$contentFormatSelecself.val();

		if ( 'video' === currentType ) {

			self.$videoField.appendTo( self.$metaboxes );

			self.$audioField.remove();
			self.$pdfField.remove();
			self.$specialDocField.remove();
			self.$playlistField.remove();

		} else if ( 'audio' === currentType ) {

			self.$audioField.appendTo( self.$metaboxes );

			self.$videoField.remove();
			self.$pdfField.remove();
			self.$specialDocField.remove();
			self.$playlistField.remove();

		} else if ( 'pdf' === currentType  ) {

			self.$pdfField.appendTo( self.$metaboxes );

			self.$audioField.remove();
			self.$videoField.remove();
			self.$specialDocField.remove();
			self.$playlistField.remove();

		} else if ( 'special_doc' === currentType  ) {

			self.$specialDocField.appendTo( self.$metaboxes );

			self.$audioField.remove();
			self.$videoField.remove();
			self.$pdfField.remove();
			self.$playlistField.remove();

			cmbSelectInit();

		} else if ( 'playlist' === currentType ) {

			self.$playlistField.appendTo( self.$metaboxes );

			self.$audioField.remove();
			self.$videoField.remove();
			self.$pdfField.remove();
			self.$specialDocField.remove();

		} else {

			self.$videoField.remove();
			self.$audioField.remove();
			self.$pdfField.remove();
			self.$specialDocField.remove();
			self.$playlistField.remove();

		}

	}

}

jQuery(document).ready( function($) {
	new CMBAdmin().init();
} );